1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Based on drivers/firmware/psci.c from Linux:
5*4882a593Smuzhiyun * Copyright (C) 2015 ARM Limited
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <common.h>
11*4882a593Smuzhiyun #include <dm.h>
12*4882a593Smuzhiyun #include <dm/lists.h>
13*4882a593Smuzhiyun #include <linux/libfdt.h>
14*4882a593Smuzhiyun #include <linux/arm-smccc.h>
15*4882a593Smuzhiyun #include <linux/errno.h>
16*4882a593Smuzhiyun #include <linux/psci.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun psci_fn *invoke_psci_fn;
19*4882a593Smuzhiyun
__invoke_psci_fn_hvc(unsigned long function_id,unsigned long arg0,unsigned long arg1,unsigned long arg2)20*4882a593Smuzhiyun static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
21*4882a593Smuzhiyun unsigned long arg0, unsigned long arg1,
22*4882a593Smuzhiyun unsigned long arg2)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun struct arm_smccc_res res;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
27*4882a593Smuzhiyun return res.a0;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
__invoke_psci_fn_smc(unsigned long function_id,unsigned long arg0,unsigned long arg1,unsigned long arg2)30*4882a593Smuzhiyun static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
31*4882a593Smuzhiyun unsigned long arg0, unsigned long arg1,
32*4882a593Smuzhiyun unsigned long arg2)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct arm_smccc_res res;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
37*4882a593Smuzhiyun return res.a0;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
psci_bind(struct udevice * dev)40*4882a593Smuzhiyun static int psci_bind(struct udevice *dev)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun /* No SYSTEM_RESET support for PSCI 0.1 */
43*4882a593Smuzhiyun if (device_is_compatible(dev, "arm,psci-0.2") ||
44*4882a593Smuzhiyun device_is_compatible(dev, "arm,psci-1.0")) {
45*4882a593Smuzhiyun int ret;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* bind psci-sysreset optionally */
48*4882a593Smuzhiyun ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
49*4882a593Smuzhiyun NULL);
50*4882a593Smuzhiyun if (ret)
51*4882a593Smuzhiyun debug("PSCI System Reset was not bound.\n");
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun return 0;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
psci_probe(struct udevice * dev)57*4882a593Smuzhiyun static int psci_probe(struct udevice *dev)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun const char *method;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun method = dev_read_prop(dev, "method", NULL);
62*4882a593Smuzhiyun if (!method) {
63*4882a593Smuzhiyun printf("missing \"method\" property\n");
64*4882a593Smuzhiyun return -ENXIO;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (!strcmp("hvc", method)) {
68*4882a593Smuzhiyun invoke_psci_fn = __invoke_psci_fn_hvc;
69*4882a593Smuzhiyun } else if (!strcmp("smc", method)) {
70*4882a593Smuzhiyun invoke_psci_fn = __invoke_psci_fn_smc;
71*4882a593Smuzhiyun } else {
72*4882a593Smuzhiyun printf("invalid \"method\" property: %s\n", method);
73*4882a593Smuzhiyun return -EINVAL;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun return 0;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun static const struct udevice_id psci_of_match[] = {
80*4882a593Smuzhiyun { .compatible = "arm,psci" },
81*4882a593Smuzhiyun { .compatible = "arm,psci-0.2" },
82*4882a593Smuzhiyun { .compatible = "arm,psci-1.0" },
83*4882a593Smuzhiyun {},
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun U_BOOT_DRIVER(psci) = {
87*4882a593Smuzhiyun .name = "psci",
88*4882a593Smuzhiyun .id = UCLASS_FIRMWARE,
89*4882a593Smuzhiyun .of_match = psci_of_match,
90*4882a593Smuzhiyun .bind = psci_bind,
91*4882a593Smuzhiyun .probe = psci_probe,
92*4882a593Smuzhiyun };
93